Employing massive antennas array at the user terminals can be feasible by using millimeter wave (mmWave) transmission which significantly reduce size. The implementation of multiple input output (MIMO) facilitates accurate beamforming. In this paper, a modified orthogonal matching pursuit (OMP) algorithm is used to design wideband hybrid combiner based on sparse structure mmWave channel and fre...

Frequency-hopping (FH) methods in the Orthogonal frequency division multiplexing access(OFDMA) system,which are to assign user-specific subcarrier to the active users, have been paid much attention to in the broadband wireless communication system. In this paper, we present a novel multiple access scheme, referred to as CDM-FH-OFDMA, which is the extension of FH-OFDMA with code division multipl...

In this paper, we develop a transmit power adaptation method that maximizes the total data rate of multiuser orthogonal frequency division multiplexing (OFDM) systems in a downlink transmission. We generally formulate the data rate maximization problem by allowing that a subcarrier could be shared by multiple users. The transmit power adaptation scheme is derived by solving the maximization pro...

This paper concerns receiver design for multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) communications systems, where frequencyselective fading causes the quality of the channel to vary significantly from one subcarrier to the next. It is common practice for MIMO-OFDM detectors to implement the same detector at each subcarrier, in which case the overall per...

Generalized frequency division multiplexing (GFDM) is considered a non-orthogonal waveform and known to encounter difficulties when using in the spatial multiplexing mode of multiple-input-multiple-output (MIMO) scenario. In this paper, a class of GFDM prototype filters, under which the GFDM system is free from inter-subcarrier interference, is investigated, enabling frequency-domain decoupling...

This paper investigates the theoretical performance analysis for a subcarrier multiplexed (SCM) wavelength division multiplexing (WDM) optical transmission system in presence of optical beat interference (OBI) which occurs during the photo detection process. We have presented a comparison for improving the performance of SCM-WDM system in presence of OBI. Non-return-to zero (NRZ), Manchester an...

The techniques to implement radio over fiber (RoF) systems using optical subcarrier modulation (SCM) and dense wavelength division multiplexing (DWDM) are reviewed, which include the techniques of SCM, millimeter-wave (mm-wave) generation and reception at base stations, and optical multiplexing/demultiplexing. The impact of system nonlinear distortions and their suppression are also reviewed. I...

The Sample Matrix Inversion (SMI) algorithm has been widely applied in the filed of adaptive antenna arrays. However, in Time Division Multiple Access (TDMA) systems with known data sequences, a low cost solution would imply the computation of the beamformer based exclusively on this data. In some cases, this might not be possible since the known data could not be sufficient to get a stable est...

The digital formation of an analog subcarrier multiplex employing in combination both a technique using pre-IFFT frequency-domain samples and one post-IFFT time-domain is proposed demonstrated. This combined enables compromise for sampling rate requirements, while maintaining low complexity good performance.